Pressure-responsive diaphragm



May 8, 1923.

F. W. STALKER ET AL PRESSURE RESPONSIVE DIAPHRAGM Filed'June 11, 1920 IN VEN TORS v ?atent ay 8, 123;.

valves, indicators and the L CK W. STALKER coaroaarion or NEW YORK.

'l- DURWOOD D. ROSEN IGNORS T0 TAYLOR INSTRUM rnrssnan-nnsronswn nrarnaaemp Application filed June .11, 1920. serial no. 388,391.-

To all wlwm it may concern:

Be it known that we, Fnnnnmox W. STALKER and DURwoon D. ROSENBURGH,citizens of the United States, residing at Rochester, in the county ofMonroe and State of New York, have invented certain new and usefulImprovements in Pressure- Responsive Diaphragms; declare the followingto be a full, clear, and exact description of.the same, reference beinghad to the accompanying drawings,

forming a part of the specification, and to the reference numeralsmarked thereon.

This invention relates to pressure responsive diaphragms of the varietyemployed to translate fluid pressure into proportional mechanical motionfor actuating like, and, more particularly, to diaphragms of the socalled capsular or wafer type.

The chief object of the invention is to simplify the character andmethod of construction of such diaphragms while at the same timeproducing a very eflicient and durable article. To these and other ends,the invention consists in certain improvements and combinations ofparts, all as will be hereinafter more fully described, the novel fea-'turesbeing pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a bottom plan view of adiaphragm embodying the presentinvention.

F 1g. 2 ,is a transverse section on the line 2-2 of F igure 1.

Similar reference characters throughout the several views indicate thesame parts.

' The pressure responsive device herein shown and described as embodyingthe fea tures of the present invention-consists preferably of a plug 1rovided on the outside thereof with screw t reads or other suitablemeans for attaching it to some ,fluid conducand is provided on theinside with a passageway 2 leading into the expansible chamber 3 whichis formed between the upper and lowerdiaphragms 4 and 5.- The latter arecorrugated as shown iii collapsed state to provide greater extensionwhen expanded. Each diaphragm is provided on its outer edge with aflange united by solder 8, and the flange 6 of the upper diaphragm is,after soldering, bent around the flange 7 of the and we do hereby .whilesubjected to pressure stresses. fiexure caused by expanslon andcontraction lower diaphragm in the manner shown. A

spacing member 9, preferably of curved cross section is locatedcontiguous to the;

the upper diaphragm and its 1 bend between peripheral flange and servesthe dual P1111; pose of separating the diaphragms and also as a form forthe bend between the upper diaphragm and its peripheral flange in orderto prevent this bend becoming unduly sharp during expansion andcontraction of the pressure chamber.

The lower diaphragm'is provided with a central aperture therein throughwhich the plug 1 is fitted. This plug is provided near its upper endwith a circumferential groove 'into which are inserted the edges 10 ofthe lower diaphragm. After the inner edges 10 have thus been insertedthe sides of the groove are compressed to'securely hold the in otherwords the edges 10 in position, or portions 11 of the plug are upset orbent oyer to securely hold-the edges 10. The top diaphragm and thespacing member 9"may next be inserted over'the lower-diaphragm,

when, after soldering, the peripheral flanges 6 and 7, one flange may bebent over the other n the manner shown to form a fluid tight o1nt.Figure 2 shows the inner edges 10 of the lower diaphragm normallydisppsed at an angle to the plane of the lower dlaphragm while thelatter is collapsed, but theseedges 10 are in substantial alinement withthe lower diaphragm when the pressure chamber is expanded, and by thisarrangement undue bending of the lower diaphragm adjacent the plug isprevented The takes place over a wider area with the arrangement shownthan would be the case if the inner edges 10 were in substantialalinement with the lower diaphragm in its normal retracted position,-while the curvature is more uniform and the stresses more nearly tensilein character. I

It is apparent that the construction is simple in character,necessitating but few parts while the method by which it is effected isconvenient and economical, and produces a. durable eflicient article.

I claim as my invention:

combination of a flexible diaphragm having a peripheral flange, a secondflexible dia- 1. In a pressure responsive element, the

phragm having a peripheral flange folded about and secured to the flangeof said first diaphragm, and a supporting member between said diaphrahaving a curved surface supporting the area of flexure of the seconddiaphragm adjacent its flange to control the radius of flexure at saidarea.

2. In a pressure responsive element, the combination of a pair offlexible diaphragms having their peripheral portions curved in the samedirection to form angularly disposed flanges a first one of which isformed about and secured to the margin of the second, and a supportingmember between said diaphragms having a curved surface in supportingengagement with the curved base of said first flangeto control theradius of 'flexure thereof.

3. In a pressure responsive element, the combination of a pair offlexible diaphragms having peripheral flange portions turned angularlyin the same direction with the margin of one of said flange portionsformed upon itself in the opposite direction transversely of thediaphragms about the margin of the other flange portion to provide asolder retaining joint, solder securing said flange margins together,and aspacing member between the diaphragms having a curved surface insupport ng engagemenhwith said first flange portion and the diaphragmadjacent thereto.

4. In a pressure responsive element, the combination of a flexiblecorrugated disk having its periphery curved gradually to provide anangularly disposed flange, a second flexible corrugated disk havingitsperipherycurved to extend in the same direcappease tion as saidflange and bent upon itself about said flange toward said diaphras iriphery of said second diaphragm to maintain the radius of curvature ofthe latter durin flexure.

5. n expansible chamber comprsing w upper diaphragm provided with aflange on the peripheral edge thereof, a lower diaphragm joined on itsperiphery to the upper diaphragm. and a spacing member-0t curved crosssection separating the upper and lower diaphragms, located in the jointbetween the upper diaphragm and its flange and contiguous with allportions of the bend whereby the spacing member by its curved shapelimits the sharpness of thebend during expansion and contraction of thechamher.

6. An expansible chamber comprising upper and lower diaphragms providedwith cooperating flanges on the peripheral edges thereof which aresecured by soldering and bending of one around the other and a former orspacing member separating the diaphragms and located in the bend betweenthe upper diaphragm and its flange and shaped to conform to the bend,said upper diaphragm being supported by its flange I and the spacingmember whereby the latter is adapted to cause the bend between the upperdiaphragm and its flange to conform to the shape of thespacing member.

FREDERICK W. STALKER. DIJRWOQD I). RUSENBURGII.

